they all have their balances pearl... you see, bow is good because of the distance... even if your opponent has phantom walk, you can start your bow attack and hit your enemy about 7 times before they even get to you.... however, your damage is lower than the glave...
with the spear and sword, yes, the spear does more damage than the sword, however, you get more defense because of the shield... you trade 1 benefit for another... if we were really efficient... you could switch weapons while you were pvp'ing... start with a spear nuke, and when the enemy gets close, switch to sword and shield for the close combat stuff..
all balanced out in the end...
ting